OK, so your distributor has slop. E-I-E-I-O will not fix that. Yeah, good some advice given already but I'll add. I'm not going to debate the EI vs POINTS discussion again, and there's nothing wrong with EI so don't write me letters, but I've never had a desire nor need to go that route. You are making one of the rookie/newbie mistakes. You're having electrical/non-starting issues and you think the 'cure' is to go to EI based on what someone told you or what you found on UTOOB. Yep, don't believe everything you see and hear on the Internet; plenty of wrong info abounds there already. FACT: EI only eliminates the need for points. Connect the setup wrong and you fry out expensive parts. There's also not a thing wrong with the OEM 6V/POS GND system either, just be sure whatever setup used you are wired correctly for it. FACT: 99.98% of all non-starting issues are due to incorrect wiring regardless if 6V, 12V, EI, or breaker points. Having the ESSENTIAL MANUALS and related diagrams like WIRING PICTOGRAMS by JMOR are important. 12V was never a FORD TRACTOR setup until the late 1950s, and then only on the new diesel models, so there is NO manual or document from FORD on wiring an 800 or under tractor for 12V. You need the JMOR PICTOGRAMS for that. Having the ESSENTIAL MANUALS ensures you have the original 6V system and know and understand it. If you don't know the 6V system and your tractor won't start on 6V, what makes you think it will on 12V or even EI? See? Plus the manuals have all the chapters for the other systems including PM and SAFETY. See? You can get your side mount distributor rebuilt with new parts. The Drive Shaft bushing is a pretty easy fix. I advise to postpone your EI swictheroo for now. It'd be cheaper to rebuild your original distributor for now and get it wired all correct for a 12V setup. Also know that all EI and 12V kits are not the same. I also listed the parts for the side mount distributor. Finally, you'll need your ESSENTIAL MANUALS first. Invest in them.
FORD 600/800 TRACTOR IGNITION TIMING & ELECTRICAL WIRING:
FORD TRACTOR I&T FO-20 SERVICE MANUAL ELECTRICAL DIAGRAMS:
FORD 600/700/800/900 WIRING w/12V CONVERSION:
FORD 600/800 ESSENTIAL OWNER/OPERATOR/PARTS/SERVICE MANUALS:
FORD TRACTOR ANGLE MOUNT (SIDE) DISTRIBUTOR PARTS
Denny Carpenter:
BUSHING: P/N 7RA-12132-A -53-UP
CLIP: P/N 8N-12213 -50-64
CAP: P/N 8N-12196 -50-64
DUST COVER: P/N FAA-12239-A -53-64
ROTOR: P/N FAA-12200-B -50-64
CONDENSER: P/N FAB-12300-A -50-64
PLATE ASSY: P/N FAD-12152-A -50-64
CONDUCTOR P/N 8N-12209 -50-64
SPRING CLIP P/N 8N-12213 -50-64
INLET KIT P/N 350032-KIT -50-64
O-RING BASE P/N FAB-12143-A -53-64
CAP CLAMP P/N 7RA-12144 -50-64
NAPA Side-Mount Distributor:
Points:
NAPA #CS749
NAPA HEAVY DUTY PIERCED (ventilated) #CS753 Standard Ignition #FD-8081 Standard Ignition Blue Streak #FD-8081X (Premium)
Condenser:
NAPA #FA66
Standard Ignition #FD-75
Standard Ignition Blue Streak #FD75X (Premium)
Rotor:
NAPA #FA67
Standard Ignition #FD-108
Distributor Cap:
NAPA #FA352
Standard Ignition #FD-128
Tim Daley(MI)