Thanks guys for the information , I can,t thank you guys enough for helping me out on this .
Things went pretty good today at the machine shop . Turns out he didn't sonic test the 401 yet because he seen pits in the cylinder walls of 2 cylinders and wanted to touch base with me before spending my $$$$ . ( which I greatly appreciated )
So I told him to sonic test it anyway as thats the only way i,m going to find out what i have to work with .
I,ll find out next week how the 401 turns out .