1970 Duster, Trans-Am-inspired "Pro Touring" build

I also swapped the driver side motor mount for a solid, the engine doesn't move at all anymore lol. I put a big rubber washer between the engine bracket and "biscuit" to hopefully prevent any stress cracking in the block or K-member (I know it's not likely but I read a couple horror stories on here). I do feel more vibration especially through the steering wheel but each time I drive the car I don't notice it as much.

I've been constantly fine-tuning the carb as well since I got the new engine running but decided to try bumping up the timing from about 20 initial/36 total to 23 initial/39-40 total (not including vacuum advance). I was afraid that would be too much advance but it runs noticeably better and pulls cleaner in the upper half of the rev range with no audible pinging, even on regular gas (compression is only 9:1 with aluminum heads and 222/226 @ .050" cam, also 5000' above sea level). I also notice my AFR readings from my wideband have gotten a bit richer, further leading me to believe it likes the extra advance.

Only major downside so far is the gas mileage, last I checked before advancing the timing I'm getting about 11 MPG around town where my previous engine got 14-15 although it was higher compression with a smaller cam. Hopefully I pick up 1-2 MPG from the extra timing, also swapped in one stage leaner metering rods in the Street Demon carb a couple days ago so we'll see. I might make a trip down to Denver to visit my friend and drive the Duster, I haven't gone on a legit highway cruise with it yet since it got the new engine, curious how the gas mileage will be then too.