Hello. I am new to the forum but I have had casual experience building several FE's dating back to 1967. I have acquired a C4AE-6015-A short block that has 4 bolt main bosses cast-in but not machined. The engine is a .030 over 390 I believe, and it is rough due to weathering. I am planning on building a stroker with as much displacement as I can get away with. The engine is for my 1957 Ford Custom and will strickly be for the street focusing on "talking points" and sound. The car (3500 lbs) has a stock 390 in it now with a wide ratio toploader and 3.89 gears. I am looking at a Comp cam 282/.571 solid lifter cam and I am designing for a 6000 rpm redline.  Has anybody added 4 bolt mains  to an engine like this after the fact? Any comments?