Stock Bucket vs Bench Seats w/ 8pt Roll Bar

I haven't dealt with roll bars myself, but I can tell you that the split bench seat is heavy and bulky -- I'm guessing it would make it hard to work the cage around it, and it would make access to the back seat very difficult. The buckets have longer track travel, and the backs flip forward farther. The backs are also narrower at the shoulder, and thinner. I even suspect you may want to go with a more modern aftermarket racing bucket, for less weight and more room. IMHO, FWIW...