If the lower was not professionally ported, that is probably what is holding you back. I was going to suggest gears and my ported lower until I saw your going to a 331 later which my lower is marginal on due to the added cubes - good to only about 5,500 rpm on a 331. A Cobra would be good to 6,500 rpm on a 331. Why don't you cruise the "for sale" adds on the forums and try to find a used Cobra or Explorer intake. Get that for $150 and you might be able to do gears to. Then address that traction issue with some real slicks!
Here is a pic of my work just so you can judge how yours might have looked in comparison. Do a search on Stangnet in my user name and you'll get LOTS of references.
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Tom (Torque) Moss
88Gt 5spd Vert, FLowmaster Catbacks, stock cam advanced 4° @ 108.5° ICL, NMRA prepped GT40P heads 1.85/1.55 valves and 1.7 rockers, MAC P headers Jet-Hot coated, 97 Exlporer intake (ported lower), TB and injectors. 277RWHP/330RWTQ (SAE).
http://www.fastlanecars.com/
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