yes a TBI guy on the TPI board
bare with me...

Heres an idea, im just going to kick around...
if i get a TPI harness and ECM, and sensors (also what sensors do i need?) theres two 4cly fuel injection engines sitting in are shop right now... could i take the injectors and fuel rails and use them? then fab them to a intake... this seems like it would be cheap to me... theres engines and cars for that matter that come in and out of are shop with in days i could maybe even use sensors from other systems?
if need be... i woundnt be asking this if TPIS came into are shop but its been a good 4 years since we even got a Camaro in there... so there ya go i could be dreaming about this hole fabbing up my own cheapo fuel injection system
or maybe keeping my eye out for other systems that come in... blah
Inless someone wants to give me there hole tpi set up for cheap you can even keep your intake!

and my hole point in asking all this is... i hate TPI intakes! and the after market ones are outta my price range, and id like to go as cheap as possible

 

Lots of variables you'd have to look into and research.

Injectors compatible with ECM drivers.
Injectors flow for the application.
Sensors give correct reading for ECM to interpet.

Just some things off the top of my head that you'd have to look into first.

 

when do we get to see this photo-chopped on your car?

 

That's basically exactly the system the old 4.9 caddies had. TBI throttlebody and intake style with port fuel injection.