porting......

ok now ive got my sl lightly modded and what not. not to much, but it can breathe good. now i want to add real power. i wanted a porting job done. now ive run into plenty of problems here. first off, i can port them for only 125 a head, but theres not a 'flowtest' place for hours, and thats hella expensive, any advise on that. also i heard that i should port my intake first, then the heads so im iffy there as well. lastly i need to worry about all the liitle "bitchy" parts that can cause delays, like makeing the valves bigger and what not. so yea, any advise is appreiciated. i live in south texas so any place near here where i can ship would be great, thanks.

frank the tank