[ROCKETWAGON]

can anyone tell me what jet and power valve sizes i should start with

 

[68NovaSS]

Not without some motor specs. That's a lot of carb for a 350.

 

[vinniekq2]

Ive used 850s on a 355 sbc.You need to tune it,great carb if you have one. I wouldnt look for one if I was buying a carb

 

[ROCKETWAGON]

350,good heads(p&p),eldebrock intake(performer),lunati cam(292-480)have a q-jet on it but not satisfied. i have a 600 holley(4160) and the 800 spreadbore. the 800 brought the 383 it was on to LIFE

 

[vinniekq2]

I would prefer you use a 4777 to wake your car up.The 800 will need more tuning because it has huge secondaries for a 350.You have a very mild cam. The performer manifold will help you as long as you do not use a spacer.keep it a 2 plane intake. Bolt it on the way it is.Of course check the jets and PV first so you can have different parts on hand for changing.
does that carb have a pressed in booster venturi?Dyno time is expensive but a worth while investment

 

[lmsport]

Is it a vacuum or mechanical secondary?

 

[ROCKETWAGON]

mechanical.
thanks for the advice.