need help on cam choice

ok. i have a 70 340. it had 12 to 1 pistons, and i had them cut down. they will now be about 10.2 to 1. have a old school holley strip dominator intake. holley 750 carb. going with 3:55 gears. do not know if i am going 4 speed or staying with the auto for now. i will be running headers. not sure of which ones yet.

the heads are 2:05 1:60 valved. it is setup with the 273 solid lifers.

i am looking for about 400+ out of the engine, but will run 93 pump gas only.

what is my best cam for this app. not much track use. just a stout driver. am i able to still use the solid lifters that were in this engine? they are new, but the cam is monsterous.

any help would be appreciated, and some part numbers will help also. i want it to have some lope, but not to where the car dies at idle