Cheers Marty, and everyone else....
I'll be going with piper, fresh cam kit with all the new rockers etc and springs at 240
bp270 cam, factors were...
-Carbs will be a restriction,
- success of my porting
-lower rpm range and a bit more manners
-first time doing this, if I can't make it reliable that counts as a fail...
 
Still unsure on the valve lengths, may have made a fatal error ordering them too soon, they are 111.5 group 1 size, and on they're way, that could be the budget breaker and a lesson learned....
Any missing pieces of the puzzle so far? Suggestions/ opinions? Am I on the right track?
Cheers again Drew
 
 
 
 

The valve lengths aren't a problem with only 1mm between them. The machine shop should compensate . .

Hey Flighter,
Yeah still on the IDF plan, there's been alot of 'sidetracks' building the car but one of the first goals was to build it on carbs... After 18 years we're still a bit nostalgic about that 
We popped, spat, farted and learned through side draughts in it's previous guise so I'm looking forward to a new challenge....
The valves arrived this week and I've been doing some extra hours at work so they'll be getting machined in soon, ready for a flow test, to see how successful I've been,.... and to get a final idea on the cam
Cheers Drew..........

Drew,
do you mean 240lbs for your springs? thats super high. something in the order of 80-90lbs seat pressure and 190lbs open pressure is what you want, max. 240lbs will just wear everything out super quick. standard springs will be fine on that cam, your going to run out of cam way before you start bouncing valves.
nothing wrong with IDF carbs, group 1 escorts used 44IDF's they work fine.
personally i would have gone for something bigger in the cam department, closer towards 290-300degrees duration with a lot more lift.
111.5 valve length is too long, it will work but you will lose valve lift, get them shortened to standard length (110.5) if your worried about it then fit them and check your wipe area on your rockers, shortening the valve will move the wipe area towards the cam giving you a greater rocker ratio and increasing your lift. you want to maximise that.
i see you went with the group 1 valves instead of the 45.5 valves? why was that? bigger the better in my opinion, no need to worry about valve-valve contact with that cam. are they triple groove so you can use the standard retainers and collets?
dont forget to get it flow tested with the manifold.
 
good to see you giving it a go.
keep it up.
Gazz