A couple of questions

[72c10step]

I have a couple questions I hope ya'll can answer:

1. I have a starter problem. It's like the heatsink problem a lot of Chevy starters have when the starter gets hot (due to running headers with no heat shield), where you try to restart the motor after running it for a while and it either won't start, or cranks really slow, then starts. I discovered one of the two grounding straps that go from the motor to the firewall. Could this be causing enough resistance to do this? Also, where does this other one mount to? It's on the driver's side, the passenger one looks like its mounted with a sheetmatal screw, but the drivers side has no empty hole in the firewall for a screw. There are a few studs coming out from the inside. Can I just mount it on one of those? (I'll try to get a pic in the morning when it's light out).

2. I recently discovered my block was one of the ones made in Mexico. I heard these were basically junk. Is that pretty much what everyone else has heard?

Sorry for the long questions, just trying to explain the best I can the first time.