I would recommend installing the body on the chassis then slide the engine as far back as you can for starters. Then add your radiator along with the support rods on top to the cowl. This way you know where the engine can be based on where the body/radiator must be. Then you can slide the engine forward & Up/Down to the fan so you have as much comfort with the shifter location.

There is not much room on the 33/34's for error. I still have a $1500.00 BABB radiator which I bought new and ended up not being able to use it as there was not enough room after the paint work had been done. It seems even a 1/4" is too much when you are out of room.

I too have a 6-Speed (got to have 3 pedals in a hot rod!), and it caused enough problems on its own when finding the best placement for the engine.

I would also take into consideration the headers, overflow tank, and distributor. You might consider one of the small HEI units as they help by not having to eat up too much firewall space. And one last note...you might plan for A/C now even if you dont plan on running one now. That way if you ever decide you want relief from the heat, you wont have to move the engine later.

Again, just suggestions. After several rebuilds, this is getting easier. Post some pictures when you get a chance so we can see the progress.

Let us know if we can help anymore.

Troy