273 question

Looking for some help on which way to go. I have a 65 Cuda with a 273 that I have to rebuild. The block needs to be bored. Machine shop wants to go .60 over. Other work needed, heads, crank grinding, camshaft grinding, regular stuff. Around 3500.00 for labor, then buy new pistons, so question is is there a better cheaper way to go on this, do these prices seem in line? It's not a #'s matching car so that's no consideration. Not opposed to another engine, 318 etc.
Thanks.