I suggest be for doing any business with mondolo ask about him at realoldspower.com many of these olds guys have real world experience with him.yes back in the day he was #1 but joe mondolo don't run the business any more and things have changed.
theres lots of guys running & building 330s at realoldspower.com get some 1st hand Oldsmobile info there.
330 has potential. some 330 nuts over at realoldspower.com terry aka. MR. Olds at realoldspower.com builds olds and has a shop, his website is
forget mondolo. Mr. Olds has build and dynoed some amazing small block olds. like a http://22.214.171.124/phpBB2/viewtopic.php?t=31181
403 with Performer RPM package 425 HP 454 TQ I say stop by there and get some free advice, or call terry at frcparts.com toll free he will be glad to talk to you.
the 403 has a bigger bore than a BBC.
I have a 403 in a 77 Cutlass Supreme
ask around over at realoldspower.com if nothing else do a search there for 403s b4 signing up.
Mr. Olds at realoldspower.com knows loves / builds and races 403s heres his web site. http://www.fcrparts.com/