1967 L34 El Camino

[67since67]

This a cool El Camino!!
I also have a '67 L34 El Camino with headrest bucket seats. As Bill said, the headrests keep the seat from sliding back the last couple notches, I am also 6'2", so I remove the headrest for driving.
Mine has a tilt column and I had a C3 wheel in it for a while, IMO the tilt wheel helps a whole lot more than a smaller wheel.
If you look for a tilt column, since '67 Chevelle columns are one application only, be careful, there are cobbled up clones marketed that don't fit.

As far as engine build, I would recommend a Hyd roller cam with about 212/218 duration at .050 and .480-.510 lift, that would give you great low and mid range torque. 218/224 duration would start to get a bit lumpy.
Your pic with the chrome fuel line suggests it may already have a 3310 Holley carb, that is a good choice as the original L34 carbs are a bit smallish.
A little more cam and carb really wakes these engines up!
You might consider setting the compression at about 9.5 so that you can run a good advance curve on pump premium.

Are your wheels DA 14x5 or DG 14x6? By chance is the original spare tire present?

Keep us posted on progress!
Bill W