If you really want to give a lot more driveability, start by swapping a short tail TH350 in place of the Glide. It's completely bolt in, and having a real first gear makes a huge difference.

Dropping a nice dual plane intake and Q-jet will help a little, but with the small heads and stock 210 HP camshaft, it may not be worth the effort.

 

a 2101 Edelbrock performer and a rebuilt junkyard q-jet will work really well on that engine.
add an HEI distributor while you're at it.
a quick trip to the boneyard will get you all the bits and pieces to get it all hooked up- any brackets and what not.
get a pump to carb fuel line off a mid 70's truck. you might also need to swap to a fuel pump with a 3/8" outlet if your car doesn't already have that- but that's less than $20 at NAPA.
if you wanna go really stealthy and make it look stock- paint the intake engine color before putting it on.

 

I had similar situation on my 68, and thought the 327 275 hp upgrade was a good mark to aim for. I ended up with headers, dual exhaust, Edelbrock performer intake, Carter afb 4bb carb, TH-350 transmission, Eaton posi, Petronix ignition upgrade, and World s/r heads with 1.94/1.50. You might consider something like the 350hp 327 Corvette cam. I'm not racing, but I have a nice performance boost. In the future, maybe a Quadrajet. Also, I am keeping the original heads, powerglide, intake, carb, and exhaust manifolds in storage. Now if I can only get the bodywork finished before the summer ends....