[455-4+1]

Hi all

I managed to pick up a 63 Cat and hopefully as we speak its on its way to New Zealand !!!. I have a few upgrades planned as a bit of a 60's period "street racer'.

In my stash over here I have a set of long branch manifolds that I would like to swap on. From the part numbers it looks like there were originally 1969 350ho / 400ho / RA III. The left has listing from 1967 to 1969, big car and FB by the looks

Part numbers are

9779495-1 LEFT
9797073-1 RIGHT

Looks like the left fits several years, (incl big car) but the right might be FB only ?

Does anyone know if these will fit my 63 Cat, 389 Auto.
I read somewhere about an angled adaptor as well being required for big cars.
I do have some angled back factory filter adaptors, but not sure if these would work, or if in need the machined one ??

I realise std head pipes may not fit, but I will be getting custom ones made here anyway, as current Exh is only single and I want to go to dual with X-over

Any insight would be greatly appreciated