Just leave the E in there. Definatley don't go for the X; it would just be a very poor fit for stock heads/intake (you said stock engine).
You could even go back to the stock cam if you wanted. The turbo will allow you split the block even with the stock cam, while maintaining excellent street manners.
1990 Mustang GT, Explorer shortblock with DSS MSS, Edelbrock Performer RPM heads, stock GT cam with 1.72RR, ported Explorer intake and 65mm TB, PTK T66 kit @ 18psi, AEM EMS + WBO2, Alkycontrol methanol injection: All Sold
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