From what I got, you want to build an economical slant that is reliable, and can be driven everyday. The slant in "stock form" is already just that. Shaving the head/block, building a cylinder head, fancy stall converter, gears, etc etc would not be economical. Sounds like you've been on .org ?
I would suggest a stock rebuild of the motor, electronic ignition, and a free flowing exhaust. Economical, reliable, daily driver. Done.
