those are the headers i'm using. i had one problem with them--one of the tubes is VERY close to the #5 plug. i could get the plug in, but not the wire. i used a shorty plug and it seems to work fine.
383 1980 monte build
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no problems other than the spark plug, and i had to modify the rod on the trans linkage thats for the neutral safety/backup/lock-out on the steering column. so if you have a column shift there may be issues but you may be able to just flip the cross rod upside down and tweek the bends. i actually put the drivers side in from the top with no problems.
it's more about how you'll be driving. street driving, you're better off with the dual-plane as it promotes low end torque. the single plane is better for top end power but can greatly reduce part throttle driveability.
Well, the difference between the intakes is not as cut and dry as you may think. It really all depends on the cam, heads, compression and RPM's you intend to turn. Hot Rod did a story on this very question using a Mopar B wedge 383 out of a 1970 Challenger ( I think that is where it came from). With a mild cam and heads, there was little difference. With parts that could support it, the big single plane did better. I would look at a Performer RPM Air Gap intake as a great compromise. In most tests, it seems to perform very well and is comparable to mild single planes. Then again, if you build a motor that needs a big single plane intake, you will also have to balance the gearing, tire height and torque converter stall speed against its torque curve to be able to use it properly.
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