Amazing progress and terrific pictures. Helluva job so far.
I too have a 1969 Conv with AC. I think you’ll be very pleased with the results from your plan as they are nearly identical to the upgrades I made.
I did not have a #s matching engine so I didn’t mind swapping out the TH400 to a 200 4R. But it is a 1969 gto 400 with a date correct fully rebuilt Q-jet. I went with an 1800-2100 stall converter on the 200 R4. You’ll also want to get the Shiftworks Overdrive kit for the shifter console. Looks exactly like factory ... but with the OD detent and label. Even lights up at night. You’ll also want to install Shiftworks Neutral Safety and Backup light switch. You’ll also need to change your transmission speedo gear. With 235/60-15 tires + the 200 4r + 3.55 posi, I ended up running a GM NP208 - 45 tooth gear (light green). My dash speedo is within 1 mph of my phone GPS at all speeds. I was shocked it was that accurate.
The 200 4R was the best upgrade I could have made.
I also upgraded my peg leg 3.23 to a posi 3.55 rear. (GM 8.2" BOP Eaton-Style (Clutch) Posi Unit (28 Spline) GM 8.2" BOP Ring & Pinion (3.55 Ratio) It's a perfect match with the 4sp Auto. Runs 2000rpms at 70mph. And I can do a very nice burnout too. I can run it like a 3sp auto around town or shift into 4sp OD for highway speeds.
Also upgraded the exhaust. In the pics below it still had the side splitters and 2.5" exhaust with headers. The headers were just too low so I replaced them with the factory ram air exhaust manifolds and a 3" exhaust from Pypes. I brought the chrome tips out the back with a slight turn down.
I also upgraded the AC to 134a using the original factory system. Works great and has held its charge for about 4 years now.
Best of luck on the restoration and keep the pics coming.
