Morris Minor Owners Club

Hi folks
I've made a bit of a mistake fitting an ital engine to my traveller.
I got things running and noticed the timing chain was making a racket.
I had forgotten to remove the 2 bolts under the crank gear and replace with countersunk screws.
I'm going to replace the chain and rectify the bolts.
Three questions:
How do I countersink the holes? The engine is in the car and the front panel is on. I'm not sure how I can get a drill bit in to open them out as there is not much space?
Is it worth buying a full duplex kit or just the new chain and screws?
Do I need to modify the ital timing case any further (the breather canister has already been modified)

Thanks
Tom

Did the Ital engine not come with the rubber tensioner chain system? If so - it's MUCH quieter in the long run than the duplex - which has no tensioner at all. Duplex is for strength - high lift cam and/or super high compression springs. And sure - it will be quiet initially because it's new - but that doesn't last for ever! However - if you persevere with the duplex, the holes are countersunk (unsurprisingly) with a countersink bit in a drill gun! If you can't get in - you will need to take the front plate off. If the chain is damaged then yes fit new - but sprockets etc will be fine.