I'm with 57halfton on this one. I have a '70 Camaro 10-bolt under mine. I picked it up for $75.00. It is the perfect width. I'm running 8" slotted mags with 275-60x15 BFGs. It had 3:42 gears originally but I put 3:73 gears in later. All I did was weld on the spring perches. Later on you will probably want to sub-frame it and wont have the 6-hole issue. Either that or run a stock rear-end for now until you figured it all out. But that is only my opinion. Good Luck!