Originally Posted by Mach1Run

Decided to go the 351 route but not sure about stoking it as a first time build. Gotta locate a block on the cheap now. Jim got it figured out after work the other day. The problem was that a bit of gasket on one the old valve covers did not come off and when the new cover / gasket went on it was sucking a ton of unmetered air. Re-did the gasket and ground down a spot or two on the bottom of the upper where it was touching the new covers to make sure it all fit tight and he says its working fine now. Probably gonna go get it this weekend.