I was going through some pics and thought of you. Here is a pic of my IA2 block and another P/Y member with the breathers. At minimum you should consider holes in that valley area while the engine block is apart to do the rings. Just saying. I'm willing to bet you'll need to run a vacuum pump.
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68 Firebird. IA2 block, 505 cu in, SD Performance E-head, Solid roller 3600 weight. Reid TH400 4:11 gear. 29" slick.
Best so far 9.95@134 mph. 1.43 60 ft.
76 Trans am, TKX .81 o/d, 3.73 Moser rearend,
468 with KRE D-ports, Doug headers, 3" Exh.
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