So after some intensive googling, and speaking to some of the gurus i know, a decision has been reached.
I was informed by a few guys far older than i of how motor builds for the Ford 400 were done back in the 80s, before there was really any aftermarket support for the 400.
A quick history lesson on the 351m/400 for those of you who don't know, it is essentially a 351C with a 1" larger deck height. However it uses the same size main bearings as a 351w, even thous it uses the same size rod bearings as the 351c. Also The 400 and 351C use pistons of similar compression heights, so when you properly select a set of 351C it can be used to bump the compression ratio in the 400. However there is a wrist pin clearance difference. Most 351C have a wrist pin diamiter of .912" where as the 400 is .975". There 2 ways to fix it are to either bore out the 351C pistons, or use a bushing in the connecting rod of the 400.
So i have decided to go with 351C pistons, and bore out the pin hole, and move forward with this project.
A good link for ford 400 info
http://www.ford-trucks.com/article/i...00_Engine.html