Hello all, I am in the works of getting a mid 80's 2 bolt 454 truck engine and TH400 trans. The trans is a core (needs rebuilding) and the engine was supposedly a running engine when pulled. I am looking to make as much hp on pump gas as possible (93oct) and am planning on using the Coast High performance 496 rotating assembly with some AFR 335 heads with a static comp. ratio of 11.0-11.5:1. I have been kinda worried about the 2 bolt block and was trying to find some info on re-drilling the 2 bolt caps and converting them to 4 bolt or just getting the aftermarket Milodon or Pro-gram main caps. The Milodon only cover 2,3,4 and not 1,5 where the Pro-Gram cover all mains. Can the Pro-Gram caps even be used on a non 4 bolt block? Sorry for the newbie questions as this is my first ever BBC build. I know some will say I should have gotten an aftermarket block, but I am getting this engine for very cheap......$250. If the crank is forged, I can prolly get it cleaned up and re-sell it as well as get the rods reconditioned/shot peened and resold as well. Any other helpful tips/suggestions towards my BBC virgin build is greatly appreciated!!