Hi Ron,
I would have to concur with Bob on this one concerning the Saito 72\Rojett 76. You really have to know your business when it comes to the 72. I said it quite some time ago and I will repeat it here, the big block is not a beginners motor. It is very different from the 40A and the 56. Granted, if you know what you are doing, it is second to none when it comes to delivering serious big time rock steady power.
The Rojett 76 is a purpose dedicated stunt motor. And, unless your engine skills are first rate for the 72; may be the better way to go. I am about to purchase the Saito 62 and as much as I love my 72, I suspect the new 62 will get the bulk of my stunt work as it is somewhat more "mainstream" than the big block. Although, the big block will still be first out of the shute on the next plane,(no substitute for that power).