800 cfm TQ or Holley or Edelbrock?
If you can get 28” under there, I don’t think it a problem on a Dart.
I’m setting up for something similar using a big TQ on a ‘71/72 spreadbore intake, ported heads, kind of a FAST thing but not for competing, same deal, light to light and cruising.
I’m going to be working with an old Hughes engines solid cam, the older solids, HEV 3945 (239/245@050) to help extend the upper rpm range and the ported heads. Out of your gear ratios, I think the 3.91’s would suite the street best as the 4.30’s will be limiting in top end speed and traction may be difficult, MAY…..
It’s all about right foot control. Some people here don’t get that.
I’d look for a cam on a 108 LSA and a duration between 236 & 240 @050 with as much lift as the heads flow well to. If good flowing ports show slowing down after .500, that’s where I’d stop lifting the valve and just try and hang the valve there as long as possible. Also lift it to max height as quick as possible. A cam like this should still work very well with a 91 octane @ 10-1 compression.
Don’t skimp on a converter if you have an automatic trans. You can get great driving converters that also work great on the street.
Focus on making the rotating assembly as light as possible.