Will my Small Block Breathe?

[rwsii]

I have an 1987 Chevy Full size truck that I dropped a 350 w/ 10.5/1. I have a Edlebrock 4bbl w/ a manual choke, closed chambered heads, headers, and the cam has a 447 lift and 222 at 50 on the duration. (I think that's considered a standard RV cam - not really sure.) It is my work truck and it might seem like overkill, but even with 30 sheets of 3/4 " plywood, tool boxes and a trailer, she doesn't even break a sweat.

UNFORTUNATELY, a bonehead on a cell phone rear-ended me and totaled it out. I had purchased a parts truck - 1987 GMC with a bad 305, which now has to become my main truck. I plan on putting my motor from my Chevy into the GMC.

My questions are:

Will the throttle body of the 305 feed my motor or do I need to change the chip in the ECM?

The GMC has stock exhaust manifolds and a standard single exhaust. Will this be too constricting for the motor?

If so - would it hurt the motor to run it like this until I get the exhaust swapped over?

Thanks for any help

Russ Smith
russellwsmithii@comcast.net