Ich könnte folgendes "beisteuern":
998cc
99H/A97P A+ block with dished pistons, pre-A+ gears, 3.44 final drive & 12-inch wheels
998 A+ block with centre locating tang in main cap, 1985 onwards
Flat top piston with circlip wrist pin retention
99H/997 From engine number 127422 with 2.95 final drive
1275cc, 1990 onwards (12A numbers)
12A/2A Carburrettor type
12A/2B Carburrettor and catalyst type
12A/2D SPi (Single Point injection - Tbi, throttle body injection) with 9.4-1 CR
12A/E SPi (Tbi - throttle body injection) with 10-1 CR
With the following suffixes:
F53 10.0-1CR, 3.105 final drive, catalyst, oil cooler
F75 9.4-1CR, SPi, 3.105 final drive, closed loop catalyst
F77 10.0-1CR, SPi Cooper, 3.2 final drive, closed loop catalyst
G01 10.0-1CR, 3.105 final drive, catalyst, no oil cooler
G03 9.4-1CR, 3.105 final drive, catalyst, May 1992 onwards
G04 9.4CR, 2.76 final drive, catalyst, French only spec
Ist aber nur ab A+ ohne Garantie auf Vollständigkeit und es gibt noch viele mehr 
Gruß, Diddi