Ls swap questions

Looking to buy a 1962 cadillac with an ls swap. Would like to know what to look check for while test driving the car? Any advice.. thanks in advanced This is the description of the ls swap.

It has a aluminum block LS2 paired to a 4l65e trans with overdrive, march performance polished pulley kit, mild comp cam, fast 102 intake, ceramic coated long tube headers, 9in Dutchman 3.73 rear end, wilwood master cylinder with CPP disk brakes on all 4 wheels, painless wiring harness