What's your compression first.

Yours is a 1400cc engine, I don't think they ever made it to the states, however several guys would put B-210 engines in 1200's

The formula I used on my fastest 1200 went something like this.

Stock 72 Pistons compared to 71 and earlier are about "Flat-Top"

A 71 or earlier Head had small cc heads and "Heart-Shaped" combustion chambers
[GM thinks the Vortec "swirl"is new, ha!]

A minimal head shave, about .008" or so.
.040" shims under the valves
a 4-Angle Valve Job

Result, 198# Compression using 71 head w/72 pistons.

Used the primary jets from a 1600 or 1800, I forget the #s
Ditto on the secondary's.

Cut the snorkel tube off to about 3" long.

Twisted the timing to somewhere near 25+ degrees, waaaay off scale.

End result, a little car that would roar like a Quadrajet on a 327 w/10-1
It would JUMP like a Camaro with a low-ratio gear.

1/4 mile times unknown, prolly low 15's or high 14's
On 93 Octane fuel.

It would eat most any stock v-8 sedan, till the 101mph top speed.

Gas mileage, 48mpg, highway speeds, no hypermileing tricks.
Worst mileage when whupping azz, 14mpg.

More than once I found myself sitting on the road side listening to the wind-up and POP of Blue Strobe Lights :D