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For 4K you could find a late model LS motor and drop it in. Pick up some power and lose some weight all at the same time. You could probably get by with less than 2k in the motor and then spend a little extra on upgrades including tranny...
If your 350 is in good shape and you have $4k to spend do this http://store.summitracing.com/partdetail.asp?autofilter=1&part=VOR%2D4GP218%2D038SQ&N=700+4294839032+4294925022+4294908216+4294840140+4294839808+115&autoview=sku
swap in big block - major cool factor
Well I have been doing some more research. I have 4k to spend, but who says I have to spend it all?What about this http://www.sdpc2000.com/product/SD8060AG/VortecHeadKitEdelbrockPerformerRPMAirGap.aspx A vortec head kit complete with intake. That would set me back about $900 and then I could spend $600 on a carb, cam and headers and I should be at around 400 hp according to the tech article for $1500. If the bottom end gives way down the road I could easily spring for a new short block.. Thoughts?