
I also wanted to add: we've had a lot of problems with bending the rear springs, just behind the front eye.

I had a pair of custom main leaves made and ran a leaf under the eye. no more bent springs! Removeing the factory main leaf is NOT fun. You can use the factory main and cut the eyes off another, add to your spring. Mine is just one step better.
The MSD distributor is just a duraspark dist with bearings instead of bushings and no vacuum advance. You want to use the vacuum advance though.
The muffler in the pic is a flowmaster 40, If you are required a chambered muffler, that is the one you want.