So I was rooting around in the garage tonight and found I have a GX390 from...something; looks like I have a donor engine for the TriRod. Now, my question is: should I be looking at strictly Comet clutches or are any aftermarket ones worthwhile? I'm needing a 40 Series driver, at the minimum. Then driven has surface rust on it -- worth sanding or simply buy new? Depending on the aftermarket, I can get a set of pulleys for about the price of one Comet. I'm not trying to be chinzy but am happy to buy the Chevy part if I don't have to buy the Cadillac one, if you know what I mean. I'd also prefer to stay away from the junk. Any input would be appreciated. Thanks.