292 exhaust manifold cracked. What to buy?

[Puddles]

So I just purchased a 64 c20 a week ago and going through it i found the exhaust manifold is cracked so I'm lookimg at what to replace it with.
Heres my issue.
My current manifold has the heat riser\flapper valve. Im trying to figure out if I can install a manifold without the heatriser\flapper valve without any issues. I'm looking at the cheap ebay replacements. Just need something to make the truck driveable without changing the rest of the exhaust or intake.
Any info would be great.

Thanks