im guessing you have the 4+13/16 bore by 6.25 stroke. that bore and stroked to 7 would yield a 509. 7.25 would get 527.
 
Got a 5.75 X 7 with the very best of everything on the shelf ready to assemble. It's twin engine has been dominating the hot classes here for 7-8 yrs and never had to touch it.
 
The sky is the limit. Water can run in up to a 5.75 bore but most are using solid blocks now. I'm doing 5.25 and it's pretty reasonable.
 
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