GM TBI on Chrysler Big Block

[Qeskimeaux at aol.com]

 I am planning to install fuel injection on my 413 Dodge  motorhome. I have 
the Chrysler distributor triggering the GM module and plan to use all GM 
parts except for  a Holley 670cfm 2"bore throttle body for 5.7 but have a few 
areas of concern. I want to use a 747 ecm because they are plentiful and used 
on 454 trucks. The nearest engine would be a medium duty truck 427 but  ecm 
for it is relatively rare. Do you think ecm will adapt to displacement 
difference if I use the 454 prom or will I need to have a custom prom burned? 
Also will ecm adjust to the dual 65 lb/hr injectors in holley TBI ? (This is 
not a high RPM application)265hp at 3600  
Will Gm Knock sensor work in Chrysler big block & will GM spark tables be 
close enough? Any thoughts y'all have on this would be appreciated.