[1990C4S]

I have this project: 1999 Boxster in very good shape, complete car, with the original engine on a skid/pallet. This engine has damaged valves, it looks like one of the chains failed, I have not dug into it, and I do not want to spend the time and money on a 2.7 engine.

I temporarily connected the engine to the harness and powered up the car, everything seems to work, the immobilizer is happy, and the engine will turn over. I assume I have spark etc. If this was a good engine, I could be driving in a couple of days.

Included with the car was a 2004 S engine, which is not compatible with the 1999 ECU. Compression is good, it looks like it's worth installing. S0 I want to get the newer S engine into the car.

I see three options:

1. Run two ECU's. I need some of the 1999 ECU/immobilizer for door locks, widows, etc. I would need a 2004 ECU (7.8 DME I think) with the immobilizer bypassed to run the engine.

2. Run the 3.2 engine from a Megasquirt ECU. Megasquirt 3 can run everything, including the variable valve functions. Keep the original ECU for auxiliary functions.

3. Sell the 3.2, buy a slightly older compatible S engine, plug it in and drive. This is my least preferred option, I would be selling an unknown engine and buying an unknown engine. And it's boring, this is supposed to be a more fun/challenging project.

Assuming my electrical and software skills are 9/10 or higher, what would you suggest?

I just want a fun car that performs, resale value is zero concern. I am up for the challenge of 1. and 2. above.