My Datsun Spirit L28 Build.

[Mikes Z car]

That link wanted me to install software.

Your post reminds me of when I first turned the key to start my 71 240 I had back in the 70s after putting new rings/ bearings in it. I also replaced the timing chain. I was afraid of monstrous backfires or other anomalies but all it did was run very slow because the timing was retarded due either to the timing chain replacement or how I put the distributor in.

[Diseazd]

Big improvement on the Panasports........much, much better!