The more info will help.
What is the cc rating of the Bosh injectors? Purpose for replacing them? If the injectors have a higher flow rate than stock this could be your problem.
How many miles on the rebuild?
What does the spark plugs look like?
Can you smell gas in the exhaust
When you get the throttle can you see the exhaust, if so what is the color?
Valve settings?
When you rebuilt the engine did you align the timing marks on the cam and crank gear with the ones on the timing chain? How easy was it for you to set the timing and get the engine to run on your first attempt?
