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I agree a 425 would be better, but this would work to get him going. That 300 mixer will be a little underpowered, but only on the top end. It will work fine for daily driving and very well off road. You don't need the spark box as that is for a TBI engine and adjusts the timing when in propane mode. You might have to find a different adapter from that 300 to your carburetor. If you do, PM me. I think I still have a box of various adapters.