[84LX89GT]

I bought a 1980 ford thunderbird on sunday, which i'm going to be putting either the 400 (351M originally) into, or the GT40p headed long block from my grey mustang (GT). More likely the 302, but i figure it's the perfect sleeper.
i bought it for $475 and the body is completely straight (needs some trim....that'll be hard to find) and the interior is about 99% perfect save for a little bit of fading on some panels and a couple of scratches. I'm seriously debating on if i'm going to keep it looking so stock that i use ported exhaust manifolds or if i'll use stuff like my MSD distributor/ignition and headers.....hmmm.....so my ideas that i like.
It has the 120 horsepower computer carbureted 255 windsor right now which is hilarious because i've never had a windsor that is so underpowered.....it actually has decent torque, but man does it die after about 2500 rpm.
what do you guys think i should do? I want to be able to open the hood and have anyone who looks at it think it's stock. How loud should the exhaust be? I could make it sound wicked or keep it subdued and stealthy....
i attached some pictures.