Chevy man needs a Mopar lesson

Performance wise, on stock gear.

Carbs;

The T-Q is an excellent street strip carb. Tiny primarys for good mileage and throttle response. Huge secondarys for wild wide open throttle performance.
The come in 2 sizes. Generally accepted as 800 and 850 cfm. The difference is in the primarys. The smaller unit has 1.5 primarys.

Intakes;

The factory iron intake is actually a capable intake. Aftermarket intakes will rival and/or surpase any GM/Chevy intake.

Heads;

Factory heads vary in performance and abilty. Generally, the 318 like a high velocity/small port head for general performance. The 360 head would be next in-line and it's stock valve 1.88 int and 1.60 exhaust.
The beauty of the MoPar heads are as said the valves. They open on center @ er...(I may get this wrong and should know this) 18*'s. (No wonder Chevy guys complain)
Ported, stock heads in capable hands can exceed 275 cfm flow.

Oh, forgot to mention that the MoPar rockers are riding on a shaft. This is a very strong and stable set up. No guirdles needed. But an upgrade would be a good route over stock parts.
Stock bars bend under strees. MoPar, Crane, Comp, Harland Sharp, Huges engines, etc...sell hardend shafts. An upgrade to ethier mechanical rockers or rollers is a good idea. There a bit more expensive than what your used to paying. Being number 3 and among the last to get stuff made, never mind cheap. It's a worthy upgrade worth the price.
Blocks;

High nickel content is stock. Chevy doesn't put that much nickel into the blocks unless there race parts. Why pay more?
The crank sits mid way in the block and isn't anything specail. Mostly cast cranks are used in later years.
Do not let the 2 bolt main scare you. It is capable of high horse power. I myself would yeild @ 500 for longevity purposes. Another 100 is OK for racing since yearly inspection and refreshing is a probable out come of such intense levels of power.

Cam;

The Mopar cams push a lifter diameter of .904. This larger lifter means you can grab a more agresive profile without extra work needed to for another engine.
Some of solid grinds can be super close to a roller cams profile.

Old (Comando) vs. New (Magnum) engines;

The only thing to mention here is a Magnum engine. There heads oil like a chevys with hollow pushrods and there rockers are a 1.6 ratio instead of a 1.5 of the older engines. But there roller cam engines. A plus. Just watch out for the new lift ratios added lifting power. Do the math.
Also, Magnum engines do not have provisions for a mech. fuel pump.

Swapping parts between the Magnum engines and the older Comando engines is easy, but you will have to ask a few questions or do a search here on it. Theres minor pitfalls to watch out for.

Oiling mods will be needed for 6500+ rpm's and for a good long life if you need to be there for any extended amount of time.