Oh... ohohohohohohohohoh..... i just did exactly the same thing (and pulled the engine out again to check... dont do that) !
Please please check to cover for the flywheel first ! its a small metal cover behind the drivers side driveshaft held in place with x2 13mm bolts, i managed to bend mine refitting the new engine, fired it up, sounded great ! foot on clutch, and it was horrid though is sounded rotational and horrid noise, all it was was that stupid plate just touching the flywheel when the clutch was depressed ! Just before you do anything else, check that :rolf: