I did all mine with new, twin pipes and carbs from a 1500 jetted for a 1300. Went, looked and sounded great! BRG of course... And it would have gone on for years if my alcoholic next door neighbour hadn't decided to park her Volvo in it. Still, at least I had toured the Somme in it and had some great times. And the reg plate said 'jism'....
Eventually replaced with a Mk1 1800s MX5 which was miles better but never had that little something....? Did keep that for longer than any car I had though and did well over 100k miles in it myself. First thing I did was service, tyres and then drove it to Africa. Roof down all the way of course!