Re: belts, I ended up using a 483 size. I can barely get a 480 onto the car (unbolting an idler pulley), but the tensioner indicator ends up pegged over at the "almost too tight" limit. With the 483 it's pegged over at the "almost too loose" limit, but it's not slipping badly or anything. Don't seem to be any inbetween sizes (even in 6-rib, which I'm using). I tried 485 and 490 before that and they were both way too loose on my car. I think we have the same basic config and same front Stillen 20% UD crank, but my alternator pulley is swapped for NST's 10% OD one.
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