Well finally got my duster back to the track after trans failure and I somehow ended up with a broken timing chain. Ive never seen that one before looks like I may have gotten reletivly lucky I can only visually see 2 bent valves. Has anybody experianced this or have some I dea what may have caused it The chain was a sa gears roller with 9 key ways and a torrington bearing in a pretty high reving 512 (7000 rpm) any recommendations as what to replace it with?

Pretty rare to have a chain break. I would check over the valve train carefully to see if anthing there failed first causing the cam gear to lock up. Assume you checked cam/crank gear alignment upon initial set up? Doubt if there is any "linkage" between the trans and chain failures.

why not change to a gear drive??

update well finally removed engine today and tore down looks like I just got a defective chain,cam turns freely hard to check valves as every one of them are bent but the pistons appear to be ok they do have some cresant chaped dents nothing im to concerned about think im going with a cloyes hex adjust or a rollmaster hope to have it going for one more race in the cool weather also thinking about milling heads and raiseing compression in prep for a e 85 conversion I think I may be able to hit my goal of 9.90s without buying new heads.