One possible source for a motor would be the one from a Hot Wheels Super Modified. The motor is part of the diecast chassis. It would have to be separated from the rest of the casting and a resin pop would have to be made from that.

Thanks, Bill! I think that would be an excellent choice for the Gremlin. Although I may have found a couple suitable contenders in my son's car collection. And he's given me permission to proceed with the transplant! (I'm not sure if that means he will be the only one allowed to drive the Gremlin, we haven't negotiated the contract yet)Thats a pretty rare duck!
I do the gumball motor conversions ALL the time. There's a thread by Ken over at SRF that I posted some of my tricks in. We could maybe migrate it.
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Im thinken' this motor is really close by comparison. Injected with fender well headers. From a "Passing Gas", by HW I believe, a 33 Wiilys.
Trim the headers off by patiently scribing and re-scribing with an exacto knife. Square out a pocket in the heads. Then remount the header in the more horizontal position like the Gremlin, using super glue. Then epoxy the backside for long term strength.
The injector stacks may have to be shaved or out right trimmed down a bit to get the re-combooberated dummy motor in under the hood.
Easily done in an evening. No casting, or hassles. If you plan your cuts and take your time, it will appear seamless, and the chrome wont be buggered.
Bill
Somewhere in Ken's world there are a lot of sad and engine-less cars...