2.7 CIH

Hello guys, have built me a 2.7 Cih with 2.2 head and 296 shaft presses at the time 187 HP. Drive it with a 2.0 LE Jetronik and BMW air volume meter but with the inn life of 2.0 Opel. Think he gets too little fuel top or from the middle of the rotary zalband. Starts at 1900 with 247nm and pinches at 4500 and comes back at 5200. Search a injection system of a car with more displacement without ignite adjustment like our LE Jetronik hurts what comes to mind??? Or does someone already have the 2.4 Motronics at the Old Block brought to run??????? Thanks for the tips LG Joe Ascona B 2,7