Any recommendations for mini starters on eBay?

If you junkyard pull (everyone here should), grab one from the latest V-8 truck you can w/ Magnum engine (~2001?). I recall the V-6 Magnum is (early Dakotas, Ram vans, ...). Cost me $10. I also pulled the battery and alt cables for my 65 Dart 273. I have factory exhaust, so can't comment. Anyway, low-risk to find what works, then buy a new one if you worry. Avoid rebuilt ones because the shops skimp. Better to rebuild a used one yourself, using quality parts. At least that's what I found w/ alternators and AC compressors. Rebuilders swap in worn parts that will just make the 1 yr warranty.