Fuel pump the Walbro 255 is a noisy pump and a lot of fakes about.
Another alternative is
https://h-tune.co.uk/deatschwerks-pe...=3826&188=3804
Speedo the best bet would be to get a axle and speedo head from a slightly later 240.
Exhaust 2.5inch is the way to go if staying under 300BHP
Distributor, dont hack the bulkhead up, changing cap etc will be a horrible job. Also note the cap and rotor arm for teh head mounted dizzy are about 3 times the price of teh block mounted type. You can use the parts from your B23
The A cam is noticably much better than the T but better still is a cam designed for a performance turbo engine like the T2 or T3 cam I would not use anything more agressive than that with a Auto box