lt1 guy's

[Fillpot]

Guys got the lt1 in my 69 camaro running some what.Here's the problem,the car acts like the timing is retarted or something,rough idle,valve rattle,and some back firing,what I have done so far is replace the opti,spark plugs,and 02s,the fuel pressure is 46lbs.Was wondering if maybe there is a problem with the pcm,was considering getting another one from pcmforless,also the car is throwing no codes,the motor and trans are out of 95 trams am (4l60e) bone stock.One more thing the car has 30lb injectors,it had a granatelli meter on it but ran worse with it on,so stuck a stock meter on it ran a little better but doesn't the meter have to be calibrated to the injector size?Any help with this would be great.THANKS!