Since a single carb is NOT going to happen, a dual quad intake is going to be very hard to find. Edelbrock hasn't made one for us MoPar guys in like 30 years. But they do show up from time to time.
Weiand still has them, though there a low rise, even the "raised" intakes are still low in height. They are also a divided single plane intake.
Overbore; best advice already given, follow it, less is better.
Exhaust; tti and headers by Doug are the best fitting headers period. All others are a 1 size fits all header unless you step up to a header like Hooker "Super" comp or Headman Hustlers. Then there price jumps and there fit isn't a promise of anything.
Cam; The cam is a part of the whole combination and subject to opinion that varies like socks at the mall. All I or anyone can do at this point is make a good "In general" recommendation of what to look for in the cam. This would be the basic's of cam's.
First, know what RPM you'll be driving in or, if it is a no hold bared engine.
Then know everything else about the car and the target of the build.
(I myself like to use as much lift as the head can handle, so know your head flow spec's)
Tell us about the intended build, target of the build and car.
While manual trannys are great IMO, a Dakota swap is not so simple.
First build?