David, thanks for the input. Yep, it's a 15x15 rim. I haven't had a chance to get serious about measuring up the swing arm mounting points, so I don't know where it's set now. I let you know as soon as I can. I'd say it's fairly long though. The powder coat isn't marked at any of the mounting holes except for where it's set now, so either it worked well there, or the previous owner just didn't want to experiment.
The car was built as a S/C car, so I was thinking the front ballast was more for making sure the front didn't pop out of the beams if the track tightened up rather than for chassis tuning. We'll probably try it without any weight first and see what happens.
Any suggestions on tire size and launch rpm?
Thanks again,
Johnny