thank you all for the wondeful replys...
I guess I'l be sticking with the 250 for now. I will look up the keen-serts and heli-coil and try one of them out. As for the second part of the ? To put a 250 in a ad truck (54) which is what I have attempted to do is alot of work. (honestly) I bought new engine mounts from Tom over at Langdon's Stovebolt, cast iron headers, ball milled alum. valve and side covers, aluminum water heated manifold from cliffords,Holley carb from Moon eyes, new lokar shifter, new gas pedal,new boooster for 4 wheel disc brake, disc brake rear 2:37 gears, 2004r tranny, disc brake kit (frt)Painless 21 cir wiring kit- new tranny mount tubular.new kick down cable,throttle cable,brake lines,fuel lines,under bed gas tank,electric fuel pump-red(holley), tranny cooler and the list goes on just like putting a V8. I must say you can do things different, IE...drum rear brakes, keep it almost stock,But what fun would that be- I also added duel exhaust with smittys and flame throwers. I plan to add a cpp drop axle and a 4 link rear/suicide doors and pop locks. In the process now of suicide job will put up some pics of the progress- hopefully by christmas my baby will be almost done- but when are they ever truely done! Thanks for the support guys and ladies- remember keep the wife happy and she will take good care of you! By the way I'm married to my Truck!
Thanks again