Firstly, do you already have your ipd header? They list them in the catalog, but it seems they don't have any to sell...

If you do have your header already, indeed, watch them upper A-arms... I've got an old header on my 1800, and it did rub on the A-arm... Had to grind down the corders of the arm, and install a 3rd motor mount to push the engine that extra 1/8" over and its been fine since.

If you don't have a header yet, I'd skip it and go with a dual downpipe stock exhaust manifold off a later B20 car. Its almost as good as teh headers as far as flow goes, and it fits a lot easier. One from a fuel injected car would be easiest, as it is not connected to the intake manifold.

The DGV is a fine carb, but it ain't a performance unit. Great for consistant, reliable running though. If you are looking for performance, go with SUs or...? If you just want a good running car, go with the downdraft weber, the stock dual down exhaust manifold, and a basically stock exhaust thereafter. Easy enough to go with a 2" system, and a free flow muffler... that ain't gonna be too expensive.

If you want a hot rod, spend a few grand on the engine, go with the header, 2.25 exhaust, and a pair of DCOE side draft webers. Or at least SUs. Now that would be fun, wouldn't it...

-Matt B
'70 145 w/ overbored B20, radical cam, biggie valves, ported/polished, and dual DCOE webers. But still no header...