Here is our combo,it consist of all the parts that every one says not to use. It started with a 1968 block bored to 4.00". Mopar 3.55 crank local dealer had them on sale for 200.00. Eagle SIR rods ebay specials 179.00,KB pistons for a 360 I cant think the part # offhand but it makes about 11 to 1 comp ebay item 224.00. The cam is a Mopar 590 solid already had it. Heads are W2s ported to mopar templets,and Harland Sharp roller rockers 1.5. A Holley intake with a 750DP. Step headers 2 1/8",DOWN TO 2" down to 1 7/8". In our 70 Dart it has run 10.60s at 125mph and that's at 5500ft DA. The car weighs 3200lb with driver,904 trans w/brake gears are 4:88s.