420a is the neon and eclipse am I not right? srt4 srt-4 swap in a 1995 eclipse GS NA 420a?

Do you REALLY want another garbage chrysler motor in your car? 420 obviously meant something to the engineers at Chrysler, so that's what they named the engine (420a). Not only is it a poorly designed engine to begin with, they upped the bar on taking shortcuts to save a dime, like making the thermostat housing out of PLASTIC! Also, the head gaskets were made as cheaply and as thinly as they could buy to save money and generate revenue after they blew (conveniently not included under warranty). Besides, 420a's tend to self-destruct easily when you up the boost because the internals aren't properly forged (so they could save another few cents). Plus, it's a soft aluminum block, which simply can't take boost well to begin with.

Do it right from the beginning and go with a 4G63. It's a bulletproof engine that has proven its tank-like durability under extreme conditions like the World Rally Championships year after year. Plus, that heavy iron block means it can take lots of boost too. Also, the 4G63 is exceptionally well understood and has sizeable aftermarket support, something that the 420a will never have.

But with such boostability, you'll be seeing that the FF drivetrain can't provide adequate traction. So you might be better off going for a GSX from the start. A 1991 Eclipse GSX will actually jump off the line faster than a 1991 Corvette, according to Car and Driver.