I’d like to look at it up on a rack and lay the system out. Might be hard to stack anything other than bullets, so solution might be a y pipe into a single big muffler and split from it.

Anybody try a Flowmaster 50 or 70 series on a big block? I got to thinking about 20 years ago I put a system of theirs on a 94 f150 5.0 and it was quiet. Believe it was a force II and it had a 70 series. Pretty hard to compare a single pipe on a 302 to this deal. That and I sold that truck 15 years ago so I can’t remember exactly how it sounded.

I've got FlowMaster 50s on 2 cars.
My '62 NY stationwagon, with a stock 413ci engine and 2-1/4" dual exhaust, is very quiet.
But its engine burns some oil and it has deposited the soot mostly in the (some 15 year old) mufflers which toned them down very nicely.

Thinking I could copy the sound into my '65 300 convertible with a 400ci with 2.5" dual exhaust and an 'advanced' cam, and it turned out to be fairly loud.
It has the newest of the bought Flowmasters. Has a nice rumble while driving and idling, but is very loud when cold. Actually a bit unsuitable for the car.

My '60 NY with 496ci engine has Dynomax mufflers but I had to add bullet style resonators at the rear to tone them down a bit. But they are still very noticable.

Where are you at? I've got a pair of Flow Master 70 series mufflers that have never been installed in the rafters of my garage. They're huge. 2.5" inlet/outlet that are both off center.

How about a y-pipe into a single 3" super turbo round long welded muffler with a 3" off the shelf v-10 tailpipe? Quiet, cheap and works with a bigger engine than yours.

Dynomax Super Turbos 17748 or 17749 depending on what fits better. They are 2.5" and flow well. Use an X or H pipe and use some more mufflers as resonators.
That's where a long glasspack is helpful.
If you do have to go to single tailpipe it has to be 3". By the time the exhaust has gotten to the back axle it has cooled and contracted some. Huge isn't so necessary back there.
R.

I’m in cincy. I don’t have the truck to see how much room I have under there. It’s getting rubber parts replaced at a shop and a general going over.

Have considered I might have to do a y pipe and maybe split at the muffler. Suppose I could run a faux tip to get the look, seems a hokey thing to do.

Just do it!!!

Super Turbo's on everything I have/had in the last 20 + yrs,only drawback is my 62 Savoy wagon,complete Max Wedge system all 3" and it is louder than I like but still the quietest 3" performance muffler out there so I live with it.