I have found pipe plugs of different manufacturers to be WAY different how deep they go.A real pain for water passages.
On my IA2 my Canton pans did have to be "massaged" for the rear main. seemed a hair wider at the block junction. Nothing Mr Ball Peen couldn't handle

My pump intemediate shaft was actuall a hair loose so the distributor is not bottoming out on it.
#4 cam bearing was a little tight so we polished the cam journal a little. we also ground slightly on the main cap to use a factory dipstick.
All of the bolt holes were properly tapped. The main seal fit well. And everything else was a good fit.
Hoepfully will finally hit the dyno this month after the PSN this weekend!
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Skip Fix
1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune
[email protected]
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
1964 Corvette Coupe 327 4 speed