Super Six vs. Hyper Pak

My personal opinion, for a street car where MPG is important.
1) increase compression (mill head)
2) reduce exhaust restriction (larger pipes and free flowing muffler)
3) 2 bbl manifold and carb (super six)
4) change cam (mild grind)
5) recurve distributer to match the other mods.
Do in the order listed, or all together.

Depending on money and/or skill, add to above
1) Valve job (stock valve sizes) and some mild pocket porting, while the head is off for milling.
2) dual exhaust outlets on engine. (Not headers, either Dutra duals, or modified stock manifold with dual outlets like Memikes.) single or dual pipes to the rear (your preferance).

PS: Best "bang for the buck" is increasing compression. There is no down side (within limits). It helps power and economy, both.
Distributor recurve should be done, after the last mod you do, as each mod, can require a differt timing curve.