1987 Pontiac Grand Prix advice?

A 327 is a really good motor to put in it, but, good luck finding one. Go with a 350 or 400. or if you really wanted to get radical, they offer a 454 small block, big block cubic inches and torque with small block size. But, for what you would spend on that, the LS1 with the kit would probably be the best bet. With the 327,350,400 swap you could use a lot of your same pulleys, mounts, and accessories.