Excellent build! Love the Med. Blue Poly color(same as my '68), and off white pieces. Go ahead and pull that wallet out again and go with a Tremec 5 speed. Just remember to go easy on the cam because cruise rpm is likely gonna be 2k or under with the 3.42/5 speed OD ratio. Go roller cam so you won't get caught with your pants down when you can't afford the correct oil to run a flat tappet camshaft these days. As you're finding out with the 327 that you bought, flat tappet cam sets are hit and miss lately, sad thing too. Great truck!