305 TBI for a 355

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>
>Can my 305 TBI work with a 355 with little or no mods. 

No, for a "hot" 355, you'll need large injectors, and butterflies.
A BBC TBI answers both questions (2" butterflies, and 80-90 lb/hr inj)

 What would changing
>a PROM do?

Everthing, please read programming 101 in the DIY_EFI area.
Programming 101 is about the 1227747 which I run in my car, and is a plug in 
for yours.  It just doesn't use the IAT.  If youhunt the archives for 747,
and 1227747, there is a ton of info about it.

  If the TBI can't work with the 355, what would be minimal mods
>necessary.  Also, will I need to change the throttle body or the ECM or just
>the chip or nothing.  Right now the motor stops making power at 4000 RPM,
>starts to slow down at 4500 RPM.  I would like it to PULL to 5000 RPM and
>that to be the shift-point. 

I run 13's shifting at 5200, with my cross fire.

 I think that I would remove the A.I.R pump if
>possible and add some shorty headers to the car.

Shorty headers or the 2 1/4 manifolds, and dual converters, 3" cat back.
Grumpy


  Also, it has no cat and
>has a Dynomax muffler right now.  Thanks a lot guys.  I have been debating
>what to do because I can't get a concrete answer on the fuel injection
>question.  I know that a Holley throttle body and the Edelbrock intake is
>desirable, BUT, in Canadian funds that means about $1200 with a Jet Chip and
>I can't afford that and the motor.  Even if the 355 dosen't live to its
>absolute most potential with the TBI, that is OK.  As long as I can pull 250
>HP and 325 ft-lbs of torque.  Thanks.  Igor.  Here is my web-site IF anyone
>is interested:
>
>http://members.home.net/igor455/olds.htm
>