Thanks wasp. Do you have the hemi conversion heads already? If you do, then you might as well just use them. If you don't, then IMO by the time all is said and done you would be cheaper off with using a repro hemi block. A stock bore hemi block you can buy a set of stock bore hemi pistons for cheap. You can use a cheap 440 stock stroke crank and a set of hemi rods. I think a set of aftermarket hemi heads can be had for around 1500, less if you pick up a set of used stock heads.