273 commando

IMO; bad combo, but hey, I've done worse.
Forget the 340 cam. Then maybe you can make something of it, if it doesn't break the pistons first.
With thge 340 cam, my guesses:
>Yur bottom-end is likely to be softer than a slanty up to 3500
>Power may not begin until 4000
>Heads done by 5000
>Rev's to 5500, if the valves don't float, but just howling.
Needs a 3500 stall and 3.91s
> stock 318 with a 4bbl, will blow it away in first gear with a 2800 and anything over 3.23s ............ and probably to 50 mph at least.
But-um gaskets are cheap.

Like I said forget that 340 cam on this combo.