it's all there, manifold inclusive for 1200cc fits A12GX head. Carbs are Hitachi HJE38W side-draft (two carbs), factory SSS carbs, Head ID A12 should have "180" or "H10" A12 GX should have "H23" by valve train.

if your 1200cc is standard A12 head, these will not bolt straight on as A12 head - Intake manifold has 2 studs at the top of each pair of inlet ports (cylinder head matches this). Standard A12 has only one stud per pair of intake ports.