I did the same thing. Sent a 1970 4-bolt 400 block to a machine shop for a sonic check. They went out of business and lost all the main caps. I only retrieved the block back. I bought all 5 mains from Pro-Gram Engineering. My engine builder installed them for $550 at the time. It was used on 4.125 stroke / 4.165 bore combo that made 699.9 hp at 6900/7000 rpm. This before the aftermarket blocks. were the norm.
"Just numbers in a check book. Tom"
.
__________________
'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 )
Old information here:
http://www.hotrod.com/articles/0712p...tiac-trans-am/
Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine)
5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension
https://www.youtube.com/watch?v=qDoJnIP3HgE