market is insane... sold a Dodge Omni GLH right before covid I had for at least ten years.. Love the car but barely drove it and now the one I sold just sold for 9k more than I let it go I see.
My head/cam/intake coupe has been running like poo lately pretty much exactly how you describe yours. Runs real rich too, pulled a9l just for the hell of it after troubleshooting the piss out of it. Of course three caps are leaking and has a trace burnt. Tickes me off because all this time...
Leave it the way it is and enjoy it... once you start down the rabbit whole of more power you sacrifice reliability, value and piece of mind simply put.
I'd want to see receipts of engine work because that intake is eatting up the low end power of that engine. If the owner who built the car didn't know this who knows what other gems you'll find lol.
I've used the Steeda one on a few cars without issue. Actually have two cars currently with the Steeda one. Shouldn't have any problems pushing it into the whole. It may require a little force but nothing where you are thinking of enlarging the whole. That is extreme and like mentioned above a...
I'd go with the TW170 heads like mentioned above. They'll clear your pistons and are better in everyway than the E7 or GT40 heads. Besides you'll be shaving off a good bit of weight from the front end and still have a good bit of room to grow performance wise for the future.
I've had a walbro 255 in at least nine cars that I can remember and have never tripped the inertia switch. I would say perhaps there was an issue with the switch itself