tunnel ram

What 600's are they?

Those are very small. I know many will argue but let them.

You should have no less than 750's that are set up by a competent carb tuner. You should buy a cam ground for the tunnel ram.

Off the top of my head, to keep engine speed the same, you will need 8-10 degrees LESS @ .050 than what you have, on no more than a 110 LSA.

If you don't get the cam correct, it will be a pig off the tranny brake, or even worse if you foot brake it, it will be lazy in the gear change and want to drive the RPM up.

The tunnel ram, when done correctly, will make more HP and torque all over, without having to twist the guts out of it.