Pulled the plenum, now what?

[scholtmj]

Pulled the plenum for the first time with the intent to replace the coils, spark plug wires, spark plugs, starter, serp. belt and fuel injectors (FIC). My car has an idle around 1k rpm and it spits black soot out the pipes (and on to the back bumper) even when driving around with modest foot control.

Some observations:
1. Strong smell of gas
2. Air box to IH hoses are VERY hard
3. Plenum runners and IH's are NOT ported
4. All vacuum lines have hose clamps or zip ties installed (Vette Doctors most likely)
5. Secondaries move but I'm not sure I'd call it 'freely'
6. Pretty dirty for only 17k miles!

Some questions:
1. How much HP will I pick up by porting the top end on a 368 motor?
2. What's the part # for IH fuel injector gaskets?
3. Is there anything else I should replace while I'm in there?