Send the block to Ryan J at shady dell speed shop he has a cnc program to make that block with all the oil returns and drill the oilpassage and rear main cap to make it oil like a regular block your big expense is going to be in the heads and rocker gear a set of pistons is the same price as is the crank and rods call Rod bloomer and get his 3.79 crank 4.185 bore your at 417 cubic inch king bearings make a bearing to make a 340 main fit in the block most 60 MM have Ford main size pm if you need some help just builds the same motor