TTi step vs. 340 manifolds

Dartswinger70 said

Id say the best glass packs as far as sound were on my 78 K5 Chevy Blazer. it was real duals all the way out the back. and it really wasnt that loud. more of a low rumble. I dont know why but maybe it had to do with the pipe diameter which wasnt more than 2 inches if I recall. It was many years ago i got rid of that thing in 96...

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I had a 74 Challenger with them. 2.5” with manifolds and no h or x pipe. The loudest it got was when I was pulling a hill. On the freeway she purred and at idle it sounded mean even though it had an “RV” cam and a 2 bbl.
Later I had a 73 Duster with a 318 2 bbl. I put glass packs on it. Same result. Then I had Flowmaster put on it. Did not like them one bit due to the bass and drone.
When it comes down to it I want the glass packs because the whole goal of completing this build is to do it with Day 2 mods. If I was around in 73 and bought this 340/ 4-speed car what would have been available to me if I wanted to hop it up? Machine the heads, put some headers on it, order an LD340 from DC, and install a differential. What mufflers were available then that are still available now?
Now if I could only find a period correct Cobra CB and some N50’s….