I used to work at Mopar Performance and did the sprint car engines. There appears to be some mis-information on these engines.

The stock 340 Crank & bearings fit these engines. Most sprint car racers make the crank w/ a special rear flange to fit the U-joint that bolts to it.

If you want to run a damper, you need a special timing cover available from Gary Stanton at Stanton Racing (this timing cover also has room to fit a special water pump.

The small Denso style starter fits most small block transmissions & bolts to the transmission - same as all small blocks.

The bell-housing bolt pattern is the same as all small blocks.

Thanks,

Jim