Need a plan - component selection for restoring 68 340 that runs on 91 oct

Usually
The bigger the cam, the lower the cylinder pressure will be, and the less likely to detonate the engine will be. But this comes with a penalty, the softer the low-rpm take-off will be. And that leads to a higher stall TC to get off the line, and bigger gears to continue the acceleration.
To do it all requires a very careful co-ordination of parts. So if the rear gears have to stay then you sorta have to build around them. If the TC has to stay, then you really have to be careful. After that the Cylinder pressure and camshaft have to be friendly one towards the other, or it all goes sour in a hurry.
Best advice I got is to forget that 2899205. That cam scrubs pressure from a build with too much, and leaves you with a pretty small .050, yeah just try spinning tires with that in an 8/1 engine. You're not at that point,yet

For a nice torquey 340, Ima guessing a 218/222 intake duration at .050, and 9.6 Scr , will have a lotta potential. The lower your rear gear is, the higher your stall will need to be. If you need a hieay gear like 3.23s, then you might like a 2800TC If you have 3.91s then you could probably use a stock teener TC.
With the Go-To 3.55s, the factory TC is a good starting point.