Cops are switched to the smallest of mods these days so engineering is a must for over 120hp ate.

The only way to get away with it is to use a a12 block with A14 crank, a12 rods and milled A15
pistons for a 1400cc hidden in the A12 block, rowland downdraft mani with 32/36 or 36/36 ida/f
on a stock looking filter housing or similar, some excellent headers/zorst, cam and the rest.
This done right will net you 100hp at the engine at best.

120hp requires very high compression, capacity with awesome planning, tuning, many hours!
A series guru style porting work that will cost more than an a stock NA ca or sr in the end.
If you have a builder that knows his stuff he can do a full sleeved, cemented A12 with 4age
early 17.5 pin pistons same A12 rods, A14 crank, cam & rest as mentioned for 1587cc, 10.5 comp
possibly 100hp atw at 7500rpm is within reach. PJZ can supply 80mm head gaskets to use.

Only a few A series tuners can achieve this and the sleeve, grouted 4age piston route
with carefully flowed head and rest would be the only way to get stock NA SR20DE power
in an A series that looks reasonably stock bar the headers but all within a little A12.

This is not unreasonable but dont expect beyond 100hp atw from an NA A series that looks stock.