Yo - big Daddy...don't do the TH350. Go for the TH700 from TCI. A friend of mine did that conversion on his 83 Z after hew blew the trans the third time. He was sorry cause your top speed sucks big ass and any fuel economy is out the window for highway crusin. Don't make the same mistake. Get a good TH700 and you'll be much better off.
Love the third gens as well. I miss my 87 TA - 305 TPI, 5speed, t-tops, digital dash, ect etc.
I dropped a crate 350 from GM (350/350 w/ alum heads) into my 86 Z with a borg warner t-56 and 3.73s. Car had bawlz and almost 30mpg. Thats a thought as well instead of the A4 if you're willing to spend the 3k on the trans and coponents. Don't forget subframe connectors after the engine goes in or those t-tops will leak a lot worse than they do now. And make sure you order the t-top moulding for an 87 or newer 3rd gen. The design is different for the water channels at the t-tops and does a better job of guiding the water away from the window instead of inside the car. And they will fit the 86 no prob. Welcome and good luck.
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"Beauty" - '00 Vert T/A M6 : 1 of 783 : Non WS6
Kooks LTR, Off-Road Y, Borla adjustable; MTI air-lid; FAST 90mm intake and TB; TA rear girdle and 3.73's, SFCs; BMR STB | Appearance Mods
"Beast" - 2017 Suburban Daily driver - Autocross - dragstrip
Whipple 2.9, Kooks Exhaust, Circle D 3k stall, 4.10s, 2"\4" drop with all the suspension goodies.
Rollin' on 24's.
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