Ok, the replacement eBay manifold arrived yesterday and it's looking good. It has a different collector pattern to the old one (which I believe is a Janspeed) - the new one goes down to two pipes much further up which frees up a bit of space to clear the oil filter. I'm not sure of the make of the new manifold but I think it might be a Raceland. It's certainly stainless steel and it weighs a bit less than the old one (a bonus).
Here's the two manifolds side by side (new one on the left):
And on the engine - old one first:
And the new one (note the clearance to the oil filter):
I've ordered up a new fitting kit with wire gasket and I'll get some new studs and hopefully get some time to fit it by next weekend.
My thoughts have turned to engine mounts. I had hoped to upgrade the mounts to reduce movement but on inspection, the drivers side mount is a basic small capacity mount. This makes sense since the car is built on a 1.1 litre shell. To change to a competition mount will probably require fabricating a new inner wing section. So, I'll leave that for now and just replace the mount with a new one (or maybe look at 205 mounts......) The gearbox mount can be easily replaced and the rear lower mount has already been polybushed so that's easy.
Drivers side mount:
Of course, all of this is just a diversion from doing the cam seals. I've rechecked the cams and flywheel are locked at TDC and found I had it wrong first time round. I'm still a bit nervous about this bit.....