66 cuda from 3/tree to 4 speed? Hard?

[Budget mopar guy]

OK everybody I need some input advice and opinions. Am currently building my 1966 barracuda into a gasser. I just ordered the speedway straight axle kit for it. I’m currently patching the front floor pans. And there is not a whole lot of trans tunnel left. But the patches should look pretty darn good when I’m done. The question I have is should I throw a four speed in this thing or built 904? The car will mostly be used for racing and going to shows that are relatively close to my house. The car was originally a three on the tree so it is outfitted with the Z bar and I have the clutch pedal set. I also from years ago acquired a four-speed scatter shield And I have 2-4 speed transmissions that probably need gone through, but they are there. I think the only thing that I would need to do is cut the Trans tunnel for the shifter but these early A bodies aren’t necessarily like the later model ones and I don’t have the experience with these. As far as modifying the transmission tunnel how much am I cutting to make this work? For those of you that have done it I would greatly appreciate some detailed advise. I literally have everything I believe to do it aside from the trans tunnel modification I even have a set of pedals. Also I have drove many manuals in my life on the street and had some street cars that I could rip gears in, but I don’t have any experience really racing a four speed. I’ve raced manual valve body automatics. The pans are not welded in yet but they are fitted and ready . Here’s a. Few pics. The paint is por15

 

[RustyRatRod]

You're gonna have to add a four speed transmission floor hump. The four speed will not fit the early a column shift floor tunnel.

 

[66fs]

Not hard to swap the 4 speed stuff in there. See post #2. You mainly just need the 64-66 four speed hump and bolt the rest in. Brewers Performance has the rest.

 

[matthon]

Does one really need the floor hump?
And gasser, not factory original.

Serious question, coming from someone who installed a hump in my last auto to manual conversion.

Not until I owned a Mopar did I find out a hump was a requirement.

I've had plenty of cars I converted to 4 speeds and just cut a hole and put a Hurst boot over it.

 

[Kendog 170]

Here's what you want. Post a Want ad here for a used one maybe you'll get lucky.
Body Components - Floor - Shifter Tunnels

 

[junkyardhero]

if you want to do it "right" then you'll need a B&T unit and the "early" shifter rods. that all tucks neatly under the hump with minimal cutting on the floor.

however you have an entire argument of: but gasser

so i'd source whatever cog box you can get your hands on, hack a hole in the floor, figure out the shifter mount or handle situation and ship it.

 

[slickchick]

???