Adding Weight or ballast in the trunk.

Cudafever said

Thanks.
A battery box is a good idea, with what ever in put in there for weight! Because, in the end i will have my battery in the trunk. So might as well us it as a weight box until i get around to buying that heavy *** welding cable/battery cable to mount it in the trunk.
Hmmmmm.

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I usually used scuba lead shot bags and lead ingots. Sometimes some extra steel bars. Tried to use rubber padding around the box walls to pad/insulate them. I used three 1/2", grade 8 bolts through the frame rails for extra security. You could get around 100 lbs of lead weight in each box. I think that's the NHRA safety limit anyway. Might be able to bolt some weight on the crossmember behind the bumper too.

Depending on the weight and condition of the leaf springs, you might have to compensate for leaf spring sag!

Don't forget to properly wire in the battery cut-off switch for the trunk mounted battery. Maybe some battery lugs outside the trunk to charge the battery without opening the trunk too. A good AGM battery would be best to use to eliminate battery acid corrosion.