Intake manifold is it stock..which gaskets to use

I used the sequence in my dad's old chiltons manual and looked it up just like you said..inside out while crossing.. lightly tourqued and waited a bit than torque to 25 than to 40.. checked manifold on dry and gap didn't look to big..but just checked with not used Cork and it's like the same size gap as the cork ..so guess I will pull apart and redoo with the cork.. should be able to get location pins ??.. and should I just get air gap..and do you know if it fits 850TQ carb
aftermarket or stock intake decision depends on your combination and is somewhat subjective. I like stock 4bbl spread bore manifold for most mild apps. If it's for a warm street/ occasional strip I'd use the stock manifold.