Nissan GA16 engine. Engine is similar to the A15, but distributor is in the back and only has fwd transmissions. This is a high output lightweight engine, some with variable camshaft technology. A GA18 is even better. There are also GA13 and GA14 but it's not really worth all the work for these smaller versions.
Sources
GA16 is fitted to FWD Nissans like Sunny/Sentra and Pulsar circa 1989-2000. Also to Tsubame Y10 (Mexico) through 2004 Tsuru B13 through 2007.
Sentra B13
1991-1994 110 hp
USA Sentra B14
1995-1999 GA16DE 1,597cc DOHC 7,200 rpm redline 115 hp (86 kW) @ 6000rpm 108tq @ 4000 rpm
Look for the Bulge on left, which indicates NVCS variable-valve timing (115hp)
Transmission
Use any 4-speed or 5-speed you want. Use the traditional method of using an aluminum adapter plate that bolts to the engine and provides new holes for the transmission and starter.
The 63A 5-speed input shaft will have to be machined.
Swap Notes
Use a manual transmission GA engine flywheel, heat the ring gear and tap it off. Put it on backwards.
Remove EGR and block, since it points backwards.
Remove distributor and fit an inexpensive EDIS crank trigger system (about $200 USD).
Weld up new motor mount brackets -- typical engine swap stuff. This is not a bolt-in swap.
Fit a carburetor (custom manifold) or convert your 1200 to EFI:
EFI fuel pump Surge tank Fuel lines Return line to fuel tank
Oil Pan?
New exhaust pipe and use 1.75 piping and muffler and tail pipe