47 degrees initial time? help!!!

Your combo is nearly identical to my current combo, 'cept I run a stick.
Your starter gear is 9.58; mine is 10.97.but your TC may even it up, for a bit, and 10.97 is more than my combo needs.I run a GV overdrive, and 10.97 is what falls out with a 3.55 x .78 = 2.77 hiway gear. with a 230* cam, my S doesn't like less hiway gear, otherwise I'd be running 3.23s and have a 9.98 starter gear. So I am sure your 9.58 plus TC will be a very nice street starter gear.
Your cam 274/286/110 with lift .488/.491; mine 276/286/110lift .549/.571
Your stall might be a lil low.Time will tell.If your tires spin, it will be fine.
275s will not be big enough, with street suspension. If it hooks the 1800TC will be a lil soft off-the-line, but only below about 15 mph.With 3.91s you might not even notice it,unless it bogs.
The rest is a wash.
My car is a 68 FormulaS clone and scales at 3650 meinit.It went 93 in the 1/8 first time out,first successful run of 4. I immediately retired it and spent the rest of the day in the stands with my son.It hasn't seen a track since.
I thought I had a fast car in highschool. A 70 Swinger 340/4spd/3.55s . It went 98 .........in the qtr..............And it was 3310 meinit(10% lighter).Compared to this S,well,really, there is no comparison.

You are gonna love yours!