cylinder head gasket

[Laurence]

Hi,
Ive got the cylinder head off my series 3 1600 beta coupe and Ive got
a couple of questions before I put her back together.

1) Cylinder head gasket, I purchased one listed for a 1600 lancia beta
but it seems its for the series one with the smaller diameter bore.
Mine has the 84mm bore, does this mean a 2l gasket will fit? Out of
intrest does anyone know what cylinder head gasket my prisma 1600ie
would take?

2) Thermostat, Ive read in a number of places about putting a
thermostat in the head. (My 3 way one seems to be stuck open) Is there
a thermostat from another car that fits the space or does the head or
pipe need to be modified?

Cheers
Laurence