1974 plymouth valiant 360 LA 904trans.

Try setting the initial timing at 17° BTDC and total timing at 35° at 2500 RPM....

If you want to have the distributor recurved for it, contact member @halifaxhops

He has a sun distributor machine and rebuilds distributors... He can curve it to what you want/need...
My timing marks only goes to 10* on the block. What do I do?