lord mounts

I have finalzed the purchase of a 7gcbc, and apparently the fun starts now. Overall, everything looks pretty good on the plane and during the prebuy it was noticed that the exhaust was rubbing on the lower part of the cowl causing a little burn mark where the exhaust is touching. The lord mounts are sagging some, they don't look too bad, and if the exhaust wasn't rubbing I wouldn't touch them till the annual. My real question is, has anyone had a problem with clearance of the exhaust and the cowling? I don't feel like there should be such a tight tolerance that sagging mounts would cause them to touch. Between the mounts, a new ELT and the cost of the maintenance, looks like I'll be pushing out that ADSB a while longer. Thanks for any input