what does the motor feel like? even a 350 tpi with heads intake runners and cam will be done making power way before 5600 rpm unless you ported them to death, car should have tons of torque and leave great and fall on its face before the 1/8 mile.
did you datalog at all yet? at full throttle if you still have stock 02, it should read .890-.920 ish, also see if it has knock counts and pulling timing at wot .
if headers make sure you put heated 02 sensor in it.
I can try and help but I never find time for my car anymore let alone someone else's. maybe you can bring it by my work sometime in etna area and I can at least hear it and maybe see something obvious.pm your number and we can meet up sometime.
Buy this kit
http://www.moates.net/aldu1-and-cabl1-p-127.html?cPath=64
Install tuner pro rt free google it.
Send me datalogs , when I have time I will look at it and tell u what's wrong.
Not much free time to help right now or I would have you come by and I would datalog it
Hope that helps some, my car had lots if false knock, killed power when I first built the car,
any track times? mine still tpi ran best of 12.7 , 355, alum heads ,lpe runners intake,lpe cam,headers, 3" exhaust
hsr lot more potentional for cheap, dropped 4 tenths with just intake change on my old motor
do it yourself. parts found at
http://www.moates.net/gm-19851995-c-64.html
all the info in the world about tuning tpi
thirdgen.org
if you need help , i can help some when i have free time. you need to do some logs and you can email them to me and I can help you out.
Found on craigslist and thought it looked familiar , I think everybody on here took her for a ride. but let me know good and the bad please before I waste my time looking at it.
https://columbus.craigslist.org/cto/5766210402.html