Hey Scott,
Just food for thought. I tossed up the idea of a jesel system for my motor and what changed my mind about it was seeing what happens to the belt on my fuel pump for my injection system. At some tracks I Have had mud come up and get in between the belt and pulley making the belt either jump off or break all together. On a fuel pump thats one thing but if it ever happened on a valve train, well, you know the outcome. I don't think that a external belt drive is good for what we do. I run a top quality cloyes timing chain and after 5 years in the motor and spinning it to 7800 rpm's evertime out, it still is nice and tight.