Engine swap

[Paid]

New to the forum so please be gentle!
I am in the market for an E21. I'm thinking about an engine swap if I end up with a 4 cylinder car. Ideally as simple as possible - I'm not after huge power - just something pokey and agile.
I've read some of the articles and from what I can tell, the key elements are engine mounts and wiring (plus exhaust, brakes, etc). What I haven't spotted is anything around fuelling if moving from a NA 315/316 to an injected engine. I assume a more powerful pump would be needed but are significant changes to fuel tank and pipework likely?
Thank you

[nic65]

Il motore 4 cilindri originale può essere modificato in modo facile, può essere prestazionale senza far perdere la originalità della vettura....
il mio 1600 è diventato 2000 ed velocissimo

[Paid]

Thank you - I will look into that. What/where are the main performance gains?

[nic65]

Alimentazioni con carburatori doppi, cilindrata ed asse a camme....