273 help!

It depends on your goals and how original/different you want it to be.

In my 67 Barracuda(in like 1991 or 92) I rebuilt the 273 with high swirl 318 heads( I forget the casting number but I think 516? I know the 360 ones are 308) with 1.88/1.60 valves to keep from notching the bore and it came out to 10:1. 510/286 Erson solid cam and re-used the stock adjustable valvetrain and topped it of with a Street Dominator intake and a 625 AVS and 3.91 gears and cheapy headers.I tried to kept it looking totally stock with the krinkle painted valve covers and air cleaner then I painted the whole engine Chrysler red.

The car SCREAMED good up to 7K. It was great fun.

Pistons may be tough to get now days but I'm not sure.