Hey Casey
I am new to this so not sure if you have replies yet. How do I get that info?
I am not a mechanic but have owned about 100 and rebuilt many, etc etc.
to assess if you damaged it the first sign would be powerloss during your 2 mile drive. If not do the compression test to check the heads. If ok then go back to basics, ie. new plugs, new points, tune carb. If problem still there find a mate with similar engine and borrow his carb. Fit it on and drive it. IF problem still there put yours back and swap the distributor, but don't do that if you are a novice as it is tricky and easy to mess it up. That may isolate the problem and save you some cash at the mechanic. If still there (and I hope not) I am not so sure that the exhaust could create the 'missing'.
Good luck,
Texas