MGF's have a very, very wide range of heads.
There are two major different types: VVC (variable valve timing) and NON-VVC
VVC types are very common, so watch out - I believe the vast majority of the later cars were VVC based engines.
There were three major non vvc variants:
Standard
135
VHPD - The VHPD heads are a VVC head with the variable timing unit removed, believe these were used in Lotuses mainly - they wanted the VVC head for the bigger valves.
The standard and 135 heads are identical, the difference is the camshafts - the 135 comes with an extra 1mm lift on the cams.
If it's a non VVC head you get, make sure that you check the part numbers on the camshafts.
If you don't mind the ask, how much did you pay for the head? They can be had brand new for about £250...
EDIT: Regardless of which head you get, I'd swap the landrover cams in - the freelander was tuned to produce peak torque low down at about 2000 rpm to make it a much more drivable engine. If you put nonstandard or 135 cams in you may get more power, but you'll have to thrash it to get it to move.