I just swapped a Holley SD in place of the DP4B on my 68 GTS and it made a noticable difference in the top end. Thanks to Mr. Porter for that recommendation; I didn't realize how short that and a torker were compared to the RPM. Plenum volume is king above 5k RPM from what I am learning.

As a word of caution with the spacers make sure that the one you place on using is big enough for the throttle blades on your carb to clear. I have seen a few bent butterflies from guys not checking and just hopping in and smashing the pedal to the floor.

You should post more picture of that thing for us. I didn't realize (or forgot) it had that tall of a tire on it.

Also, I'd start looking around for a rear end housing too Again, something you car slowly put together on a budget. With the superstock theme of the car it would be awesome to have a Dana with a chrome cover sticking out underneath.