I don't know anything about TBI. But I'm running a 500 CFM Edelbrock 4 Bbl on an Offy intake on my 292. 500 is beyond the scale for a 300 CI block (292 @ .030 over = 296 actual) at 4500 RPM. I've had to lean it way down. I rarely go over 3 grand except maybe on the freeway. 670 would be way over-carburated if it's anything close to a carburator set-up.
Also I have Clifford headers. They work real good, and this is the second engine they're on. [They went 250,000 on the last 292.] My engine has a Crane 260H cam. I have a Pertronix ign set-up in the future -- stock points right now. Vehicle is a '68 C/10 stepside, with SM465 and 3.73 posi rear. Tires are 235/85R16LT Dunlops.
I/I #4101
'71 GMC Jimmy 350, sm465, np205,3.73 posi.
'68 C/10 Stepside 292 (.030 over) Offy Intake, 500 CFM AFB,Clif headers, sm465, 3.73 posi.
'67 K/10 454 project.
'72 K/5 rolling frame project.
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