Hi all,

I'm new to the forum and still kind of a newbie to FI. I've done a few FI swaps but don't know much on the programming side or making changes from factory settings.

I recently put together a small V8 for my 86 Astrovan. I re-ringed a 68 307 shortblock, added a set of 305 HO heads and a TBI intake. Exhaust is stock manifolds with a 2.5 x 2.5 crossover going into a 3" single all the way out the back with a 3" turbo muffler and no cat. This is the cam I used:
Chevy 283,325,350,400 Cid Small Block Chevy Hydraulic camshaft,
1500-4000 RPM Range,
278 intake/288 exhaust Adv Dur,
Duration @.050 204 intake/214 exhaust,
Valve lift 420 intake/443 exhaust,
Lobe C/L 112

For the FI, I used everything stock off the 4.3. Throttle body, injectors, and ECM are all stock to the van.
It actually runs pretty decent with no check engine light on which surprised me. I does seems to idle low once the engine is warm; about 600 rpm. I'm thinking also with the extra cubic inches and more aggressive cam, I'm probably running lean once I hit highway speeds. My thoughts were to change the injectors to the larger 350 TBI ones and swap to the 87 and up model 1227747 ECM with a performance chip programmed to take advantage of the cam profile. I heard that the 86 model ECMs are too old and shouldn't be used. Any thoughts on the best route to take?