Sweet spot for a 63?

Thanks.
What sort of gains may I see going from 20 to say 25psi?
Maybe 4-5mph or is that too optimistic?
Thanks again.
 
maybe 3.5 MPH if you have a lockup convertor

whats your complete combo?
injectors intercooler, ect

im just basing this off a buddys car that had

PTE63 with PTE .63 housing, ported lower intake, PTE front mount, msd 50s, vigilante single disk 3500 stall,THDP, 68MM t-body,lonie deirs trans, 28x10.5 et drags,


1.51 60' 10.98 125+

car ran 11ohs and teens all the friggin time and had no AC
 
83's,V2 front mount, 210/210 billet roller, ported&polished heads, Fel-Pro,ect. pretty much everything but headers.
 
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