will 360 j heads fit on my 273

I've got a 273 with J heads that have had 2.02 intakes installed. The pistons are 10.5 compression. Cylinders are fly cut for clearance. With these heads the compression is pretty low and decent power doesn't happen until 4000 RPM. NO low end. Fortunately the 273 holds up to high rpm but the thing is a real pain for street driving. I'd recommend a good overhaul on stock heads for a 273 or put some 1.86 intakes in the original heads to retain decent compression.