Need some opinions to make a good street suspension

Recommend the following suspension changes that won't have to be un-done if you go to the 340.

Re-bush front end and rear leafs. Choose between original rubber or polygraphite.

Get the shocks with stiffest re-bound you can find. This will reduce "float". There are different schools of thought as to whether springs should be a higher rate or not. However, there is no difference of opinion on shocks, stiffer is better.

If you want to stiffen the springs using a salvage yard source, get the springs (tb & leaf) from a 340, 360, or 318 w/factory A/C car. If you get lucky and find an A39 car (cop car) grab the rear anti-sway bar and associated hardware. Stiffening the rear springs without corresponding work up front will make the car understeer more.

Front and rear anti-sway bars. Replace LCA with ones with tabs in order to use factory bars. Results I've heard from aftermaket front bar attachements have been mixed. When installing floating caliper front disc brakes, reverse the spindle. Otherwise the caliper will make contact with the anti-sway bar.

Decide on manual or power steering. If you decide to go power, find a 318 cop car and grab the box, pump, and cooler. Even so, the steering is going to feel a little over-assisted. This can be fixed by going to a smaller steering wheel.

Save wheel and tire upgrades until you get a BBP setup under the car. I personally like old school, so am sticking with 15" wheels. I think that 17" with low profile tires still maintain a decent sense of proportion. Larger, IMHO, makes it look like a Hot Wheels car.