Randy,
Douglas also milled his block .300
He also pounded his bearings & needs new ones.

Early blocks are no thicker in the cylinder walls,that I know of.
What cylinder head do you want from EDY?

Douglas' orange car overheats on the street w/the 4" bore, but if you want a 4" bore for a race car,,,, go for it!!!!

MBHD


12 port SDS EFI