Your B 18 from 64 has 90 BHP ,the P 1800 had 100 BHP
To convert to Webers on a RHD car you will have problems with the stearing column if my memorie serves me correct. You probably have to use the short inlet manifold from the P 1800 Weber kit
I looked at the 2,5 kit in the States and it is nice but costly.
A "cheaper" solution is to use Volvo B 21 crank ,B 230 rods ( 8000 RPM) VW forged pistons This will give you approx. 2300 cc on a B 20 block 2100 cc on a B 18 block .Volvo made a 2200 cc 180 BHP kit in the 1970 !
Use the Volvo M 46 overdrive g.Box from the 240 Turbo or the M 47 from the 940 god for 230 /240 BHP or even better the M 90 from later 940 and 960 ,5 speed gearboxes for up to 400 BHP
Rear axle with disc from P 1800 ES 1970/72 will fit nearly without modifications . It will fit the 1967 122 S without any modification.
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