How far is your motor set back?
Moving the engine back 1" moves 100 pounds from the front axle to the rear. I set the engine back in the Duster 3/4" just by simply moving the mount brackets to the other side of the ears on the block. I had to shorten the driveshaft and make minor mods to my headers but it improved weight distribution to 49/51.
The Scamp is a chassis car and the carb is very close to the cowl plus we moved the rear 2.5" forward and the front axle 1" forward making a 111" wheel base car now 109.5"