I generally use Cloyes for everything but had to go through multiple billet sets to find something for the last FE that fit correctly. Crank to cam centerline was stock on that however I recently went through a basic Jasper SBF rebuild that was line honed a bit. In that case the Ford Motorsports chain had quite a bit of slack on a fresh engine but the STD Cloyes double roller I replaced it with was actually a touch tight. We've always had to fit and verify timing sets but there seems to be a wider range of variation now. Another thing is that the "premium" IWIS chain on the FE sets I returned also had formed (split) rollers that were not quite round and some even had a step between the sides prompting me to contact Cloyes directly. The bottom barrel roller again was fine and featured one piece rollers and pins with even press. I'm not intending to deter anyone, simply suggesting careful inspection of any set you buy.
With the set Jay makes I'd like to hear about it's use in any such high mile situation vs needing the retainers retorqued. Not a big deal as once set a simple spacer could be made to help retain position. I'm mostly just curious how it's faired in such a situation vs being checked and reset from time to time.
