1300 lbs is nice and light. Our 225" wb Heritage JF car with an all iron 400 ci SBC weighs 1445 WITH our driver. No blower. We run 7.0's with a best of 190 mph on pure alky.
So you are happy with your MSD distributer ? All the Heritage JF teams find they need MSD mag's either 12amp or like us 20 amp, with no problems. We moved up to the 20 amp when we started running more compression and more fuel to keep it from missing. We run the 20 amp in my SBC and the Gene Adams built Hemi. How big a battery do you need running the dist ? No battery needed with MSD or Mallory mags. Only battery needed in JF is a one pound battery to run the transbrake and RacePak.
Good luck with your new chassis.
I really do not like mags. I run a very old MSD 10 Got to be over 20 years old. MSD discontinued these because they didn't want it to compete with their new line of mags. I run a Std full size battery, It's right behind my 80# of lead. I run a Pro Comp distributor. We self start and run on the one battery, never an issue, never a miss. The MSD 10 easily equals the pro mag 20, as told to me by MSD Our last pass in 7.0 torched the tips off 3 plugs and removed all the porcelain from them, no misfire. We are going to run A fuel & the MSD 10 will stay on the car untill it dies & then we will install the MSD 10 PLus. I have been 6.60 @220 on nitro 30 years ago with a MSD 8 before they were released for sale. I am always looking for more MSD 10's and the coils -