I have built a -73 440" based 505" stroker. Half filled with hardblock, BCR alu maincaps and a BCR girdle. Bore is 4.350". Magnafluxed, sonic checked. Flattop KB pistons, eagle H-beam rods 7.100 and a 4,25 440 source crank. Indy 440-1 heads, jesel shaftmounted rockers 1,7. Will run it on E85...