food for thought : Whilst researching the BRM Development I came across this snippet
https://www.motorsportmagazine.com/archive/article/january-1979/51/chrysler-competitiveChrysler themselves used a DTV bellhousing to connect up the ZF 5-speed gearbox with the standard road engine in a red Avenger, TAC 691R. This car was immaculately presented for the road and O’Dell used it for many thousands of miles
take your time, re read that again
so that means there as another 'option' even if it is as obscure as finding an Auto Bell housing (Plan A : and Plan A is always the best)
now we have a Plan B
DTV is of course Vauxhall
https://www.carandclassic.co.uk/magazine/vauxhall-chevette-hs-car-classic-drives/The key thing to remember about Vauxhall’s Chevette HS is that it’s not a Firenza HP. It might sound like a silly thing to say, but the parallels are many and varied. All of the familiar ingredients which make the droop-snoot coupé so special are also present and correct in this limited-run Shove-it: the 2,279cc slant-four twin-cam motor, the feisty and endlessly playful rear-wheel drive chassis, clickety-clack dogleg gearbox
https://en.wikipedia.org/wiki/Vauxhall_Chevette#New_ZealandThose with very sharp eyes will note that the 76.2 mm. stroke is the same as is used in a 2.3-litre Vauxhall (such as the Chevette HS2300). This would mean that an item like a DTV steel crankshaft could be modified to fit this engine. Remember that the rallying Chevette used a Lotus-headed version of the Vauxhall iron-block slant engine and that, in the past, engine engineering experiments between Lotus and Vauxhall were routine and you begin to see that quite a lot was already known about the Lotus engine in sporting use.
(there's a lot going on there in that Page)
I'm not sure what Bell or if more mods were required, just logging this here for future investigation / potential
I'm also struggling with a quick Google Image search of the "Box" or layout of the housing etc
https://www.tapatalk.com/groups/droopsnootgroup/chevette-hs-getrag-gearbox-for-sale-t9346.htmlMar 05, 2015#1
Hi All , Just thought i'd put this up here first before putting it online.
FOR SALE , Chevette HS Getrag ( 265 ? ) Direct drive 5th , 5 Speed gearbox , has rear flange not splined , Comes with Alloy Bellhousing to fit any slant four , and Gearstick .
Came out of a car converted for rallying about ten years ago , unknown milage .
I bought it to fit in my Viva but never got around to it .
Offers or advise what it's worth!
Pick up from Devon ,

de-coding all I've pasted here a Slant-4 appears to have a similar Bellhousing? (Pic above seems to have a 12 o'clock bolt that would be superfluos, anf the "10 & 2" (or "11 and 1") O'clock bolts seem about right by eye-crometer eh?