Would like an estimate

Hard to say. Need more info.Just guessing here.Any of the slant 6 stuff is useless,,BUT 360/727/8 1/4 is a good setup for your 66.What we don't know is ,,Is it in the car ? and we're not too sure what you mean by "Driveline cost"?? Do you mean drive shaft ? or the price of the 360/727/8 1/4 combo? Love to help if we can.