Great idea. If the car hasn't been setup for the larger engines, put the A12 back in and start racing in the stock class where driver skilz can be honed.

Search oZdat for ka24de head and L series, grab a hot cuppa and enjoy the info

What kit is this?, I'd be interested.

You could complete the L series install, get z20 front timing case, toyota 22r crank sprocket to suit single chain and Ka24de head, run carbs and good pipes with megajolt like DDgonzales is selling the kit for, get if not done good brakes setup suspension then engineer it to cruise to simple events you choose.

Alot of work ahead of you but some good things already sourced too.
if interested for reference look at some of the L series engines converted on Ozdats site

Ok, I might get chewed here, I might not. To start with. I have a 72 1200 sedan shell, with a L20b and 5 speed strapped into its bay( tunnel cut out) I bought it like this.
I own 2 spare a12s, and 3 4 Speed gear boxes.

I am looking at making the sedan, a beginner circuit/ hill climb car. Maybe even put it on the roads for a bit.
The question is what is an ideal set up to begin working towards.