Don't even think about it. Aluminum rods have a VERY limited life cycle, and they WILL break. If they are stock size, and the rpms are limited to less than 6000, you could easily throw in some stock rods and rebalance. Balance may cost a little more if mallory is needed, rods will cost $20/ea tops. I've got loads of them in storage if you want some. Or find some Eagle SIR rods for less than $200.00.
Isn't your piece of mind (and your cobra) worth $500.00? Or do you want to worry about ventilating the block and spraying the tires with
oil every time you go for a drive?